Can anyone suggest possible reasons why this might be happening? Compilation is succesful. We have analyzed the code. Can't figure out any logical errors or syntax errors(else wouldn't compile).
closed as unclear what you're asking by duskwuff, DoxyLover, Dmitry Grigoryev, Autistic, Voltage Spike Apr 3 '17 at 15:48
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My bet is that you didn't attach the core IO to pins, so the optimizer went llike this:
"Hmmm... there's this whole bunch of code with constant inputs, and none of its outputs is actually used."
In this case, the optimizer... optimizes. Unused code is removed. Synthesis tools are pretty good at this, because they have to.